Born at Ferrara, he was educated at the university there, and in 1525 became its professor of natural philosophy. Twelve years afterwards, he succeeded Celio Calcagnini in the chair of belles-lettres.
Between 1542 and 1560 he was private secretary, first to Ercole II and afterwards to Alphonso II of Este; but having, in connexion with a literary quarrel, lost the favour of his patron, he moved to Mondovi, where he remained as a teacher of literature till 1568. Subsequently, on the invitation of the senate of Milan, he occupied the chair of rhetoric at Pavia till 1573, when, in search of health, he returned to Ferrara, where he later died.
Besides an epic entitled Ercole (1557), in twenty-six cantos, Giraldi wrote nine tragedies, the best known of which, Orbecche, was produced in 1541. The bloodthirsty nature of the play, and its style, are, in the opinion of many of its critics, almost redeemed by occasional bursts of genuine and impassioned poetry; of one scene in the third act it has been said that, if it alone were sufficient to decide the question, the Orbecche would be the finest play in the world.
Of the prose works of Giraldi, the most important is the Hecatommithi or Ecatomiti, a collection of tales told somewhat after the manner of Boccaccio, but still more closely resembling the novels of Giraldi's contemporary, Matteo Bandello. Something may be said in favour of their professed claim to represent a higher standard of morality. Originally published at Monteregale, Sicily, in 1565, they were frequently reprinted in Italy, while a French translation by Chappuys appeared in 1583 and one in Spanish in 1590. They have a peculiar interest to students of English literature, for providing the plots of Measure for Measure and Othello. That of the latter, which is to be found in the Hecatommithi is conjectured to have reached Shakespeare through the French translation; while that of the former is probably to be traced to George Whetstone's Promos and Cassandra (1578), an adaptation of Cinthio's story, and to his Heptamerone (1582), which contains a direct English translation. To Giraldi also must be attributed the plot of Beaumont and Fletcher's Custom of the Country.
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